Many of us are not aware that BizTalk Mapper can map the Source Fields to Destination Fields automatically.
There are two options available for Auto Linking.
2. Node Name
Auto Link by Structure:
This will map source fields with destination fields one by one (structure wise) without looking for the name of the node.
This can be achieved by holding SHIFT Key and dragging from the source Root node to the destination Root node
Auto Link by Node Name:
This will map the Source node to the matching destination node.
This can also be achieved by setting AutoLink By Property to Node Name and holding SHIFT Key and dragging from the source Root node to the destination Root node